In case the air gap in an induction motor is increased____________?
Correct answer: B. the power factor will decrease
- A. the magnetising current of the rotor will decrease
- B. the power factor will decrease
- C. speed of motor will increase
- D. the windage losses will increase
Explanation
Increasing the air gap raises magnetic reluctance, so the motor draws a larger magnetising current and its power factor falls. The phrase “magnetising current of the rotor” is technically imprecise because magnetising current is supplied by the stator.
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